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Notes from the Field – A Summary of the KVM Forum

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I attended the KVM Forum in August of this year, and as a new Red Hatter with a lot of VMware experience, it was eye opening. I am seeing a lot of interest in Red Hat Virtualization from my customers, and so I wanted to understand the platform at a much deeper level. KVM is the technology that underpins the Red Hat Virtualization platform. A number of themes emerged for me as I attended sessions and enjoyed the hallway track. This was a forum for developers by developers, so infrastructure types like myself were far and few between but that did not impact my enjoyment of the conference. In fact, as a technical guy coming from a server background, I learned a lot more than I would have learned from a typical infrastructure focused conference. Below, I will highlight some topics that stood out to me.

Containers and Virtualization

One of the over-arching themes I noticed at the Forum, was how developers can make virtualization more attractive for users who are considering containers as a fundamental layer of abstraction. Developers are intrigued with the possibility of deploying infrastructure in minutes rather than weeks. Containers also allow developers to define the infrastructure needed for their applications and ensure that each time their application is deployed it gets the same resources no matter the environment. Containers do not provide the same level of isolation as virtual machines. A VM has an entire operating system to itself that believes it’s installed on it’s own (virtual) hardware. It must share resources with the other VMs running on the same host, but the hypervisor proxies access to physical resources. A container has only the binaries and libraries defined as required available to it, and runs on the same (Linux) kernel as other containers. The kernel proxies access to physical resources like it does any other user mode process. Cgroups and namespaces provides isolation. For environments where high security or guaranteed performance is required, this is not a sufficient level of isolation.

Read the entire article here, Notes from the Field – A Summary of the KVM Forum

via the fine folks at Red Hat.

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